Object Viewing Distance Minimum Rule by Width Checker
Observed distance/object-width ratio relative to independently applicable caller display rule. Not universal art-viewing distance, full object visibility, accessibility or crowd-safety approval.
Description
Viewing-distance ratios compare an object width with a measured viewing distance.
Viewing-distance ratios compare an object width with a measured viewing distance.1
A supplied ratio criterion does not determine sightlines, detail visibility or access adequacy.
When to use Object Viewing Distance Minimum Rule by Width Checker
Use this tool to calculate or review the supplied observations under the stated rules. Establish the object or visitor scope, measurement units and independently applicable conservation, engineering, access or editorial reference.
How to use Object Viewing Distance Minimum Rule by Width Checker and understand its results
- Establish the object or visitor scope, measurement units and independently applicable conservation, engineering, access or editorial reference.
- Enter observedObjectWidthMeters, observedViewingDistanceMeters, callerRequiredDistanceWidthMultiple, using the field meanings and rules below, then run the tool.
- Read result.observedDistanceWidthRatio, result.meetsCallerDistanceScreen. Use the units and sign conventions below.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedObjectWidthMeters | Observed object width meters | number | Required |
| observedViewingDistanceMeters | Observed viewing distance meters | number | Required |
| callerRequiredDistanceWidthMultiple | Caller required distance width multiple | number | Required |
Require positive object width and required multiple, and nonnegative viewing distance in meters. Divide distance by width and flag ratio≥required; equality passes.
distanceWidthRatio=distanceMeters/widthMeters; meets=(ratio≥requiredMultiple) Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Structured result; its nested fields below contain the actual calculation or selected reference | object |
| result.observedDistanceWidthRatio | Observed Distance Width Ratio | number |
| result.meetsCallerDistanceScreen | Meets Caller Distance Screen | boolean |
{
"input": {
"observedObjectWidthMeters": 2,
"observedViewingDistanceMeters": 3,
"callerRequiredDistanceWidthMultiple": 2
},
"output": {
"result": {
"observedDistanceWidthRatio": 1.5,
"meetsCallerDistanceScreen": false
}
}
}Limitations and assumptions
Object condition, observation coverage and applicable references determine applicability. A supplied comparison or record does not certify conservation treatment, engineering, access compliance or insurance eligibility.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Extremely large composite outputs are rejected.
Alternative or Complementary methods
For a related step, use Gallery Visitor Capacity Fire Code Area Rule Calculator: Gallery area-based capacity depends on usable area and an applicable area-per-person factor. For a complementary comparison, use Wheelchair Reach Display Height Compliance Checker: Wheelchair reach depends on the applicable access standard and the actual approach geometry.
References
Similar or alternative tools
- Gallery Visitor Capacity Fire Code Area Rule Calculator
Gallery area-based capacity depends on usable area and an applicable area-per-person factor.
- Wheelchair Reach Display Height Compliance Checker
Wheelchair reach depends on the applicable access standard and the actual approach geometry.